PT

1. Pacific Time
2. Personal trainer, or training
3. Physical therapy
4. Physical training
5. Postal telegraph
6. Pupil teacher
7. Purchase tax (historical)

pt

1. Part
2. Past
3. Past tense
4. Pint or pints
5. Point
6. Port
7. Post-town

Pt (chem)

Platinum

• bibliothecary
• biblist
• biblists
• bibs
• bibulous
• bibulously
• bibulousness
• bibulousnesses
• bicameral
• bicameralism
• bicameralisms
• bicameralist
• bicameralists
• bicarb
• bicarbonate
• bicarbonate of soda
• bicarbonates
• biccies
• biccy
• bice
• bicentenaries
• bicentenary
• bicentennial
• bicentennials
• bicephalous